godan verb (-su), transitive verb
do; commit; accomplish; achieve
Colloquial transitive verb meaning to do something, often with a nuance of pulling off a feat, committing an act (sometimes negative), or achieving a result. Similar to やる but with a slightly rougher or more emphatic tone.
彼はまたやらかした。今度は何をでかしたんだ?
He messed up again. What did he do this time?
よくそんな大仕事を一人ででかしたね。
You really pulled off such a big job all by yourself, huh.